Head set



FIG. 1 is a front perspective view of a head set showing my new design, the rear perspective view is not part of the claimed design,

FIG. 2 is a side elevational view thereof,

FIG. 3 is a side elevational view thereof,

FIG. 4 is a front elevational view thereof,

FIG. 5 is a top view thereof; and,

FIG. 6 is a bottom view thereof.

The broken lines form no part of the claimed design. 

The ornamental design for a head set, as shown and described. 